Dash-pot.



PATENTED DEC. 11, 1906.

DASH POT.

APPLICATION FILED JULY 18. 1905.

iJS-YLE, OF lilflll YORK, JERSEY CITY, llEll JERSEY, A @ORPOEATION OFNEWV ANDREW hi.

COMPAQY, OF JERSEY.

ASSlG'NQR ro oris ELEVATOR BASH-POT.

Especificutiorb. of Letters Patent.

Patented Dec. 11, 1906.

Application filed June 18.1905- fl Efi- 270,301.

citizen of United Stetes, and. jl-PCOSldCHl of t "New fiorli, in gtuegcouutyi; and his 2 1. 2 iorlz, have invented new rovezneuts inDosh-Pots for "eutiou relates to dash-pols.

and shocks in the opem-- have to he of y applic. dosh-pols use" inoouuecmm with it.

it GIlllJL-l oer-min pea;

l: ff Liiuril .112; 05

i believe to he new and .s not cou- ,1

construction "ii a useful; but in its broader aspect. filled toparticular features.

A d ilicailty which has attended the use retarding devices, suchdash-pots, with hoisting apparatus has been that the deshpot asordinarily constructed is capable only of reciproeeiug motion. The formswhic 1 have been developed have been adopted to stesn1-engine Work, forexample, in which the psrtsmove repeatedly over a. relatively shortstroke. Such devices are wholly unsuitable for use with hoists, becausein genersl the path of the moving parts in u. hoist is a Very long andthe use of desh-pot of coincident length is prohibited by expense andmechanical difficulty, such as keeping the poi-is in slinement.

Another 12 of retarding device which has been us to some extent is om Iwhich 5 vanes like of e peiler mo in :L

"iseous liquid, such as oil or glycerin. ll liileihis is cups bio ofOQ-Ql'uhltil, it is effective only for role.-

closed chamber filled with tivel 'siosll powers unlessmade prohibitivelylarge, si'ice the oil or other liquid acquires a rotary motion withinthe cylindrical case and revolves with blades which it is Ines-lit toretard, the only effect being that "due to inertio.

For these devices I substitute a dash-pot which (in the form in which itis illustrated in this application) consists-of a cylinder and pistonwith intermediate device s gee-ring it to the drum or'other moving partof the hoist. The best way ii; which it has occurred to me to emhody'theinvention is to have the piston to act as the nut and the piston-rod tohe screw-threaded and rotate, thus comhhihg a slow motion of the pistonI Vv'ltil'fl reietiyely short travel compared W 11111 that of. the ropeupon the drum.

The )lsioil recuirocoles in oil and as the l 7 described urroiioouioutgears down the 1110- tiou, if the oil alone were relied upon to 'checkthe motion of the piston, it would give-rise to excessho pressures :indtl1e opporotus would weight mud cost in order to stand the small .l orthis reason 1 combine with the pi-tou-rod s friction device which willsuhs. .inlly assist in reiarding its rotation. lb application thefriction device our of a series of interleaved disks, :oiuo of "or areattached to the piston-rod and some oi which are loose, but areprevented from rotation by my suiteble loose 5 connection with the caseof the dashpo't.

By this arrangement the pressure of the oil forces the disks together,and the friction between them, when under pressure, acts to materiallyretard the rotation of the pistonrod and diminishes the strain. upon theWhole apparatus. i regard this as e very important feature of 1ui.iu'oution.

' s between the dash-pot and the (lllllll nuiy he so selected as to giveany desired ratio between their movements, this being l mited only bythe strength of materials COlHpUHiHg the ep iieratus. As afur therprotection against sudden shocks at the end ol the Si1'UlIB--ii8, forexample, at the hot-tom of shafti arrange e by-pess for the fluid which:lilis the cyliudor and adjustable rents, 'ch are in succession coveredby the piston as 11) up roaches the end of'its stroke. 1 PIGiQl to i is:these (cuts of progressivelydecreosizig :lL'X-P, so that the retardationeffected by t l-1e deslupot will be progressively increased as it nearsthe end of its stroke. It is manifest that when the last vent is cov- .lby the piston the motion of the hoist Lil so so, zit'lcost in thoseforms of the de- +109 in which :1. liquid is employed as the re.-

terdiug medium in the cylinder.

cranks C 3 is a. ratchet engeging with the pawlDT The parts so fardescribed are all 'old and. well, known. Of. course any power'may'beapplied to the hoist-steam,

electric, or other;

At E, I show a device designed to release the pawl D upon occasion andconsisting of a chamber supplied with compressed air through the pipe E.A latch e is forced downward by the pressure of the compressed air uponthe diaphragm, and when its pressure is released for any reason a springe forces up the latche. D is a bell-crank leverv carrying the weight Dthe bell-crank lever engages with the latch e of the compressed-airdevice. A pin (1 is fast to the heel of the pawl D. The pawl 'is alsocapable of manual operation by means of the rope F.

The operation of'these parts is as follows: When the pressure isreleased from the pipe E, the latch e rises, the lever D is releases,

and the weight in falling brings the arm dlof the lever against the pin(1, striking it a hammer-blow and forcing the pawl out of en-- gagementwith the ratchet, releasing the drum, and permitting the hoist-rope (notillustrated)'to unwind. This part of the device is described and claimedin my penning application already hereinbefore' referred to,

andl therefore make no claim for it in this case. Upon the shaft 0 isthe driving-gear C meshing with the gear G The latter is keyed to theshaft G, rotating in bearings in the cylinder G, This shaft isscrew-threaded, and upon it is thethreaded piston G To retard the motionof the shaft and piston,

'a brake comprising a systeinof rings G G is prov ded at the top of thecylinder. The rings G G" are prevented from turning in the cylinder bysplines, (not illustrated,) and the rings G G are caused to rotate withthe shaft by means of splines securing them to it. In the piston is avalve g, which permits the oil, with which I prefer to fill thecylinder, to

- flow freely. in one direction through the piston, thus throwing thedash-pot out of action while the hoist is lifting its load. A by-pass Gis provided, and the rate of flow of the oil from one end of thecylinder to theothcr is regulatedby means of the vents g g g be tweenthecylinder and the by-pass. These are, as already indicated in mystatement of invention, preferably of progressively-decre 11g size, thevent g being larger than the vent g, &c., and as 'the piston descends itcovers them successively, thus progressively increasing the retardationof the load as it approaches the end of its travel. s

i It should be noted that at all times excessive speed of the hoist isprevented, in that when the speed of the dash-pot piston is increasedthe back pressure of the oil or other fluid beneath the same isincreased, and consequently the brake is more or less applied. Thedash-pot mechanism' therefore coacts The arm cl of with the brake toregulate or govern the 7 speed of rotation of the hoisting-drum or thespeed of travel of the load.

Of course, the valve 9 may be omitted from the piston if it is desiredto make the dashpot operative in both directions, as may sometimes bethe case, and the vents g, &c.,

and friction devices may be employed at both ends of the cylinderwithout departing from the invention, the modifications in shape andarrangement made necessary by the change being evident to an engineer.

In order to prevent the turning in the cylinthereof, andmeans, operatedby the dash- I pot mechanism, for actuating the brake.

2. The combination of a dash-pot, a friction-brake.cooperating therewithto retard a moving part, and means within the dash-pot and'operated bythe lluid-pressure, for actuating the brake.

3. The combination of a dash-pot comprising a piston and a singlecylinder, with means for opposing the motion of the piston byfluidpressurc, and means for opposing to its motion. a frictionalresistance.

4. The combination, with a dash-pot having a part thereof geared to arotating mechanism, of a braking device "composed of a number of disks,means for: rotating some of the disks, and means, operated by thefluidprcssure in the dash-pot, for forcing the disks together.

5. In a dash-pot, the combination of a piston and cylinder, a rotatingscrew-threaded piston-rod operating the piston by a thread passingtherethrough, and means for progressively increasing the retardation ofthe piston as it approaches the end of its stroke.

nf'ln a dashiipot, the combination of a threaded piston, ancylinder anda rotating threaded piston-rod, with a by-pass. and a plurality ofadjustable vents betweenthe by Iro cation of the brake inpiston-rodfpassing theretlnough, with a bypass and aseries of vents ofprogressively-decreasing size between the cylinder and the by-pass, thevents being arranged in the path of the piston so that they shall all besuccessively covered by it as it reachesithe end of its stroke.

9. The combination of a dash-pot, and a brake within said dashpot.

10. The combination of a dashot, and a friction-brake inclosed therebyan cooperating therewith to positively retard a moving part.

11. The combination with a daslnpot, of a brake cooperating therewith toretard a moving part, and means for governing the appliproportion to thespeed of said moving part.

12. The combination with a dashot, of a brake, and means connecting theash-pot and brake to regulate the application of said brake to a movingpart in proportion to the speed thereof. I

13. The combination with dash-pot mechanism, of a friction-brakeinclosed thereby and cooperating therewith, and means comprising aby-pass and a series of adjustable vents for effecting a regulation orgoverning of the application of said brake.

14. The combination with a dash- 0t, of a brake, and means effecting thevariab e application of said brake to a moving part to regulate thespeed thereof.

15. The combination with dashot n1echanisni, of a friction-brakeincloset thereby, and means for effecting a variable rc ard ation of amoving part by the application of said brake.

16. The combination with a dash-pot piston, of a receptacle therefor, arotary pistonrod, a bi .tke, and means effecting the application of saidbrake to check the rotation of said piston-rod.

17., The combination of a dashnot stop motion apparatus for a moving boy, and a brake inclosed by said dash-pot apparatus and cooperatingtherewith.

18. The combination with a hoist, of dashpot screw stop-motion apparatustherefor, and a brake enacting with said stop-motion apparatus to effecta gradual stopping of the hoist at a predetermined point in its travel.

19. In a dash-pot, the combination of a cylinder and piston, a rotatingthreaded piston-rod operating the piston, and a frictionbrake retardingthe rotation of the pistonrod.

20. In a dash-pot, the combination of a cylinder, a piston, a rotatingthreaded pistonrod operating the iston, and a series of interleavedfriction-dis storming a brake to resist the rotation of the piston-rod.

2]. In a dash-pot, the combination of a piston and a cylinder containingfluid, a rotating threaded piston-rod operating the piston, and a seriesof interleaved frictiondisks, some of which rotate with the piston-rod,and some of which are held against rotation; the pressure of the fluidin the dash-pot forcing the disks together and causing them to operateas a brake upon the rotation of the pistonrod.

ANDREW M. COYLE. iVitnesses 'l. J. JonNsroN, MARY AGNES NnLsoN.

